Yukiko Muromachi

Oyuki
A rival of Ryko since their college days she is also a Superintendent in the Tokyo Metropolitan Police Department based at the Public Security Bureau. Her subordinate is Akira Kishimoto. Being the daughter of a former career police officer she refuses to use her family ties to help her in her Superintendent duties. Ryko calls her Oyuki. She is also 27 years old like Ryko